JSFiddle - React, Tailwind, and code Playground
by mrleroylee
HTML
<div></div>CSS
div { background: #000; height: 100px; width: 100px; margin: 10px; }
div:after { content: ''; display: block; position: absolute; top: 10px; left: 10px; z-index: -1; width: 100px; height: 100px; background: #ddffdd; }